Interesting; It is slightly more correct to use the thread local env variable
(rather than a global) if you have many renderers. Just call the correct method
and set "simple" for that thread prior to calling the renderer .... scalable
solution without a GUID hack.
--
Jody Garnett
On Wednesday, 6 July 2011 at 7:18 PM, LSA wrote:
> I used approach with EnvFunction.setGlobalValue("simple",
> simpleFeatureFilter ) and it worked like a charm.
>
> One small notice, I used GUIDs instead of "simple", because in our
> applications we have many renderers sometimes.
>
> Thank you very much,
> Sergey
>
> On 05.07.2011 18:28, Jody Garnett wrote:
> > In your calling code you have a choice....
> >
> > static ISimpleFeatureFilter SIMPLE_FILTER = ....
> > Filter filter = ff.equals( ff.function( "wrapper", ff.literal(
> > SIMPLE_FILTER ) ), ff.literal( Boolean.TRUE ) );
> >
> > 1) Your ISimpleFeatureFilter is handed as an literal and thus can be
> > copied when Style needs to look at it
> > 2) It does not (and your original does not) indicate to the rendering
> > system what attributes it wants the feature to have; so they may not
> > be requested (and the feature could be full of empty null values at
> > runtime). Just so you know ...
> >
> > The other thing you could do is use an environment variable ...
> > http://docs.geotools.org/latest/javadocs/org/geotools/filter/function/EnvFunction.html
> >
> > This is a good choice if you want want to change the value over time
> > (perhaps as your user interacts?).
> >
> > EnvFunction.setGlobalValue("simple", simpleFeatureFilter );
> > Filter filter = ff.equals( ff.function( "wrapper", ff.function( "env",
> > "simple" ) ), ff.literal( Boolean.TRUE ) );
> >
> > .. later ...
> >
> > EnvFunction.setGlobalValue("simple", simpleFeatureFilter2 );
> >
> > Do you have a JIRA issue open on this topic? It would be good to
> > record some ideas and actually solve this; and it would be nice if you
> > can tell me if the above ideas work (perhaps I can get a blog post or
> > a tutorial out of this discussion).
> >
> > --
> > Jody Garnett
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